This vintage black onyx 925 sterling silver signet ring is a unique and stylish piece that exudes an air of mystery and sophistication. The square shape and cushioned black onyx stone add a touch of elegance, making it perfect for various occasions such as Mother's Day, Christmas, and birthdays. The ring is hallmarked and signed, ensuring its authenticity and quality. Its size 9.5 makes it a versatile option for most fingers, and the sterling silver base metal adds a touch of luxury. Perfect for those who appreciate antique jewelry with a secret society vibe.